`a, (7/4 + {-3}/5) : 2/3 + 3/2 . (1 - 3/20)`
`= 23/20 : 2/3 + 3/2 . 17/20`
`= 23/20 . 3/2 + 3/2 . 17/20`
`= 3/2 . (23/20 + 17/20)`
`= 3/2 . 2`
`= 3`
______________________
`b, 2021 - (1/3)^{2} . 3^{2} + 2022 . (2012^{2021} - 2021^{2})^{0}`
`= 2021 - 1/9 . 9 + 2022 . 1`
`= 2021 - 1 + 2022`
`= 2020 + 2022`
`= 4042`
______________________
`c, 7,5 . {-3}/5 - (1,2)^{2} : (1 - 3/5)^{2}`
`= 15/2 . {-3}/5 - 1/4 : 4/25`
`= -9/2 - 1/4 : 4/25`
`= -9/2 - 25/16`
`= -97/16`
______________________
`d, (-1/4)^{2} . 4/11 + 7/11 . (-1/4)^{2} + 15/16`
`= (-1/4)^{2} . (4/11 + 7/11) + 15/16`
`= 1/16 . 1 + 15/16`
`= 1/16 + 15/16`
`= 1`
